Topic: poor 997 imageing

[mulliemark]

      I have 2 used 997's  and the imaging is just horrendous at low speeds  at any thing below 1 plus mph  everything is blurred and it is hard if not impossible to pick out detail. I use them on the bow and have tried them on 2 diff t/d's same results. I can look at my 798 running at the same time and the pic is way way better, any thoughts?





mark

[Humminbird_Greg]

What Chart Speed are you using?

[mulliemark]

chart speed of 1 and these are the better ones

[LocDown]

Is the transducer mounted on the trolling motor? If yes, is the trolling motor pointing forward while scanning?

[mulliemark]

yes and yes

[Humminbird_Greg]

For a speed of 0.3 and 0.8 mph that may be as good as it gets.  I'm not 100% sure on this as it has been a very long time since I have tried any Si imaging at these speeds.  I do know that you will have to keep a very straight track and constant speed at these slower speeds to get any sort of clear image.

[mulliemark]

when your on the t/m these are the speeds you get. My 798 resolution  at these speeds is light yrs ahead of the 997

[rnvinc]

You mentioned 2 - 997's....

Are both 997 units using their own xducer...and both have this same problem...??

Have you tried either of the 997's on the 798 xducer...??

Rickie

[LocDown]

I tend to get better readings at 2-3mph at chart speed 1 at 455khz. I can't seem to get my 800khz scans to be as clear so I gave up on that freq.

[mulliemark]

yes but thats not the speed you scan at on a t/m
Rn I only run a 997 at the bow and my 798 on the console  and when I am on the t/m I spin the 798 around  to compare images at sub 1mph

[LocDown]

I've never been able to get very good scans going that slow. I always end up turning or something messing up the sidecan.

[mulliemark]

I am talking about the part when you are traveling in a fairly straight line and the 997 can't pick out detail unless something is very close to being under the boat then it can pick out some fair detail

[LocDown]

I wonder if your transducer for the 997 has deteriorated. Can you swap the 798 and 997 and see if the problem is the transducer.

[mulliemark]

same result with  2 diff  ducers one of which is new

[LocDown]

How about leaving the trolling motor in the water with the 997 on and using the outboard to maybe go 2-3mph and see if the scans look any better.

[silentkilla]

I've always read that it's best to have SI on the Trans & DI on the TM! Works good that way for me.